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Vintage Synth Repair

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Re: [vintagesynthrepair] Re: CS-70m power supply issue, -15V rail is dead

2013-08-02 by eidorian@...

I'm sorry, not at all!  I just haven't been able to get to my venerable 
old Tektronics CRO, which is buried at the rear of my shed behind an 
enormous pile of junk that is too unstable to climb over :-(

Your advice is excellent; my failure to follow it is the only thing 
lacking.  Please accept my apology, I appreciate your help.

Cheers,
A.


On 2013-08-01 08:20, cpt.zilog wrote:
> Excuse me but I'd like to know if I did say something false or stupid
> in my previous message ?
>  Don't want to sound rude, but if my idea is wrong, my ego can handle
> it as long as someone corrects me (and write it!) ;)
>  Thanks
>
>  >
>  > --- In vintagesynthrepair@yahoogroups.com, "cpt.zilog" 
> <cpt.zilog@> wrote:
>  > >
>  > > Hello guys and sorry to jump in like that but I would suggest to
> change the big caps as a priority and then check the bridge rectifier
> again for leakage of AC current.
>  > >
>  > > I had a big problem with a D&R console's psu in which the
> voltage regulators kept on going Kapput. Turned out that the big
> Electrolytics were bad and that induced a big stress on the rectifier
> bridge, which in turn had the consequence of not only letting DC pass
> as expected, but also AC at the same time !
>  > >
>  > > I did test for AC leakage on the rectifier after the newly
> installed voltage regulator worked for a couple of seconds before
> shorting...
>  > >
>  > > After new BIG caps, new bridge rectifier and a 2nd new voltage
> regulator, everything was sorted.
>  > >
>  > > Good luck !
>  > >
>  >

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